<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .father {
      width: 400px;
      height: 400px;
      background-color:pink;
      margin: 100px auto;
    }
    .son {
      width: 200px;
      height: 200px;
      background-color:purple;
    }
  </style>
</head>
<body>
  <div class="father">
    <div class="son"></div>
  </div>
  <script>
    var father = document.querySelector('.father');
    var son = document.querySelector('.son');
    father.addEventListener('mouseover', function() {
      console.log('11');
    })
    father.addEventListener('mouseenter', function() {
      console.log('22');
    })
  </script>
</body>
</html>